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At 10.5 inches, this Ballistic Advantage Modern Series barrel hits the perfect balance for 300 Blackout shooting. It's long enough to extract full velocity from your ammunition without the wasted length and weight of a longer setup. The cartridge was literally designed for AR-15s, and this barrel proves why the 10.5" length is where the 300 Blackout truly shines.
Machined from 4150 Chrome Moly Vanadium steel, this barrel is built to handle thousands of rounds. The QPQ corrosion-resistant finish is a serious upgrade over traditional chrome lining. Unlike chrome that gets laid on the surface, QPQ actually converts the barrel steel itself, so you don't lose any critical bore dimensions. That means your precision stays intact from day one through thousands of rounds downrange.
The 10.5" length is the rare breed that works well with both supersonic and subsonic loads without needing an adjustable gas block. With supersonic rounds, you get roughly 92 percent of the velocity you'd see from a 16" barrel. With subsonic ammunition, velocity stays consistent since the powder burn completes fully in the extra barrel length you get versus shorter options. That dwell time also means less unburnt powder coating your gun after a day of shooting.
This Modern Series barrel uses a Distinct Rigid Profile (DRP) contour that keeps weight reasonable while maintaining rigidity where it matters. The pistol-length gas system is sized for the shorter barrel length, which ties everything together for reliable cycling. The M4 feed ramp extension comes QPQ coated right alongside the barrel so you're getting consistent durability throughout. The 1:7 twist rate handles the heavier 190 to 220 grain subsonic bullets if you go that route, and it stabilizes lighter supersonic loads just fine too.
Ballistic Advantage backs these barrels with a sub-MOA accuracy guarantee using match-grade ammunition, and real customer experience confirms these barrels perform. This is the foundation of a reliable 300 Blackout build that won't let you down whether you're running suppressed, unsuppressed, or switching between load types.
Yes, 10.5 inches hits the sweet spot. You get optimal velocity for both supersonic and subsonic loads while keeping the overall gun length manageable, especially with a suppressor. Going shorter loses velocity with subsonics, and going longer adds unnecessary weight and length for minimal velocity gain.
Yes. The 10.5" length gives enough dwell time that subsonic rounds cycle reliably without an adjustable gas block. You won't experience short-stroking like you might with shorter barrels, though some builders still prefer an adjustable block for fine-tuning suppressed shooting.
QPQ nitrocarburizing converts the barrel steel itself rather than building up a chrome coating on the surface. This means no dimensional buildup that affects precision, and the finish is actually harder and more corrosion resistant. Your bore dimensions and accuracy stay intact through thousands of rounds.
No, it's the barrel only with the M4 feed ramp extension. You'll need to source your own .750 inch gas block and pistol-length gas tube. This gives you the flexibility to choose quality components that match your build needs.
| UPC | 819747022035 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BABL300008M |
| Model | |
| Product Type | Barrel |
| Color | Black |
| Caliber/Gauge | .300 AAC Blackout |
| Barrel Length | 10.5" |
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